Items in the system font cascade list may lie about whether or not they support italics.
In order to get the truth, we need to use the physical font underlying the font in question,
because this one won't lie. Then, we can interrogate this physical font about its traits
in order to synthesize italics correctly.

+This test makes sure that the Japanese system font can be italicized. The test passes if the character below is oblique (either because the font supports it or because WebKit synthesizes the oblique).

+This test makes sure that the Japanese system font can be italicized. The test passes if the character below is oblique (either because the font supports it or because WebKit synthesizes the oblique).